Work-holder.



G. M. DEEMS.

WORK HOLDER.

APPLICATION FILED mm: 10, 1901.

901,595. Patented 0012.20, 1908.

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G. M. DEEMS.

WORK HOLDER.

Amman-10x Hum JUHE 10,1907.

901,595. Patented 0011.20, 1903.

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UNITED STATES PATENT oEEIoE.

CHARLES M. DEEMS, OF INDIANAPOLIS, INDIANA, ASSIGNOR TO SALMON W. PUTNAM 31),

OF FITOHBURG, MASSACHUSETTS.

WORK-HOLDER.

Specification of Letters Patent.

Patented Oct. 20, 1908.

Application filed June 10, 1907. Serial No. 378,171.

To all whom it may concern:

Be it known that I, CHARLES M. DEEMS, a citizen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented certain new and useful Improvements in WVork-Holders, of which the following is a specification.

The object of my present invention is to provide a strong, eflicient and easily manipulated work holder for holding the work in that class of lathes adapted for the turning of heavy articles, such as locomotive driving wheels. These lathes commonly embody two heads carrying face plates positioned oppositely to each other, between which the work is held while being turned. To do or secure the work in such a lathe by or inary devices requires considerable labor, as it must be held very strongly, both on account of the difiicult nature of the operation involved, and of the speed required in order to produce the work with the desired rapidity.

My said invention consists in a practically automatically-acting dog or work-holder secured to the face plates of the lathe, and adapted to engage and grip the adjacent surfaces of the work, as will be hereinafter more particularly described and claimed.

Referring to the accompanying drawings, which are made a part hereof and on which similar reference characters indicate similar parts, Figure 1 is a perspective view of a lathe of the character in question, having a set of locomotive driving wheels mounted therein ready for turning and secured to rotate with the face plates by means of my improved work holders; Fig. 2 a fragmentary perspective view somewhat similar to a portion of Fig. 1, but on an enlarged scale; Fig. 3 a plan view of my improved work-holder and a fragment of the face plate to which it is attached; Fig. 4 a front elevation of said work-holder separately; Fig. 5 a detail sectional view at the point indicated by the dotted line 5 5 in Figs. 3 and 4; Fig. 6 a view similar toFig. 5, but on a smaller scale to enable the inclusion therein of the remainder of the structure, and Fig. 7 a detail horizontal sectional view at the point indicated by the dotted lines 7 7 in Fig. 5.

My improved work holder has a body portion 21, shown in the form of an angle plate, which is secured to the face plate 10 (upon which it is mounted) by means of suitable bolts 22 which engage with T-slots in said face plate, as shown. The horizontal portion of this member 21 extends outwardly from the face plate toward the work a suitable distance, and at its outer edge is cut away at the central portion to form a socket-such socket being somewhat greater than one-half of a circle, as most plainly shown in Fig. 7. Into this socket the inner end of the main jaw of the dog is fitted. The said inner end of this main jaw is in the form of a circular head 24 and its outer end 25 is cam-shaped, and is also serrated to enble it to take a good grip on the work. This jaw is held in place in its socket in the main body member 21 by suitable plates 26 and 27, and the whole structure is held together by suitable fastening devices, as bolts 28.

The operation of this dog or work holder will be readily understood by an inspection of the drawings. The serrated face on the end 25 of the dog comes in contact with the adjacent surface of the work. The cam shape of the j aw causes it to grip the work more tightly the greater the force applied. The aw is brought into initial contact with the work by an automatically-acting means, as a suitable spring 31, and may be held out of contact altogether, when not in use, by a suitable latch or keeper 32.

In operating upon work as heavy as that which is designed to be operated upon by tools of this character it is desirable that such work be held from movement relativelyto the revolving portions of the lathe in either of the two directionsthat is, that it be prevented from turning in the reverse direction as well as caused to travel in the working direction. In order to suitably provide for this I provide a second jaw 41, which is pivoted to the plates 26 and 27 by means of a bolt 42. As is clearly shown, especially in Figs. 5, 6, and 7, this belt does not come in contact with the main jaw at all, although the axis of movement is the same, as the hole through the head of said main jaw is considerably larger than the diameter of the bolt. A spring 43 performs the same service for this engaging member 41 that the spring 31 does for the engaging member 25; and a latch or a keeper 44 likewise corresponds in purpose and operation with the latch or keeper 32.

The operation may be described as follows: The work (as locomotive drive wheels 11 and 12 with their shaft 13) are placed in position between the face plates 10 of the lathe, and are suitably mounted on their own centers. Said face plates being provided with my improved lathe-dogs or work-holders the jaws or engaging members thereof are released, by disengaging and swinging back the latches or keepers 32 and 44, where upon said jaws, under the action of the springs 31 and 43, will automatically fly forward and engage with the adjacent surfaces of the work. When power is applied to the lathe the serrated, cam-shaped faces of these jaws 25 will take a strong hold upon the surfaces upon which they bear, thus effectually securing coincident rotation between the face plates and the work. Reverse movement of the work is prevented, as already explained, by means of the lighter but similar jaws 41. "When it is desired to remove the work, the jaws a1 are swung back and held by their keepers at, and then the work can be released, practically instantaneously, by reversing the lathe movement while holding the work. The main jaws are then swung back and held by their keepers or latches 32, and the work can be removed free from engagement with the work-holders or dogs, which, however, are ready for instantaneous reengagement when another piece of work is placed in the lathe.

Having thus fully described my said invention, what I claim as new and desire to secure by Letters Patent, is

1. In a work-driver, the combination, with a work-engaging driving member, of a jaw carried by the work driver and adapted to engage the work and prevent a reverse movement thereof, said jaw having a cam-face gripping portion.

2-. In a work-driver, the combination with a pivotally mounted work-engaging driving member, of a cam-face jaw adapted to engage the work and prevent the backward movement thereof, said member and jaw being movable about a common axis, and impellingmeans tending to move the jaw into contact with the work.

3. The combination in a work-driver, of a jaw carried thereby for engaging with and driving the work, a second jaw positioned on the driver, to prevent a reverse or backward movement of the work, both of said being mounted on an axis which is transverse to the axis of the driver, and impelling means for each jaw tending to move the same into contact with the work.

4. A movable work-driver comprising a camface drivingdog, a camface aw ar ranged reversely of the dog and adapted to prevent a reverse or backward movement of the work, impelling means tending to move the dog into driving contact with the work, impelling means tending to move the jaw into contact with said work, and latching means for the dog and jaw for holding the same retracted out of engagement with the work. I

5. The combination with a work-driver, of pair of relatively reversed jaws mounted on an axis common to both and each having a gripping portion constrained to move in a path oblique to the direction of the movement of the aw.

6. The combination with a work-driver, of a pair of relatively reversed jaws mounted on an axis common to both and each having a gripping portion constrained to move in a path oblique to the direction of movement of the jaw, impelling means for each jaw tending to move the same into engagement with the work, and latching means for each jaw for holding the jaw out of engagement with the work.

7. In a work-driver, a jaw connected to the driver and adapted to prevent a reverse movement of the work, said driver having a socket and said jaw having a head turnably fitting the socket, the axis of the socket and head being transverse to the axis of the driver.

8. The combination, in a work holder, of a body member containing a socket, a main jaw having a head which is mounted in said socket, said head having a central opening, housing plates secured to said body member between which the jaw is placed, a bolt smaller than the hole through the head of the main jaw mounted in said housing plates and passing through said hole, and a secondary jaw carried by said. bolt, said two jaws thus having the same axis of movement while independently mounted.

9. The combination, in a work holder, of a main body having a socket, a jaw mounted in said socket, housing plates embracing said jaw, a second oppositely operating 7 aw, means for urging the respective jaws into engagement with the work, and keepers for holding the respectivejaws out of engagement with the work.

In witness whereof, I have hereunto set my hand and seal at Indianapolis, Indiana, this seventh day of June, A. D. one thousand nine hundred and seven.

CHARLES M. DEEMS. [Ls] Witnesses:

GHEsrnR BRADFORD, THOMAS W. MOMEANS.

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